var restArr = [];
google.load("gdata", "2.x");

/* Loads the Google data JavaScript client library */
function initCalLoad()
{
  // init the Google data JS client library with an error handler
  google.gdata.client.init(handleGDError);
  // load the code.google.com developer calendar
  loadDeveloperCalendar();
}

/**
 * Loads the Google Developers Event Calendar
 */
function loadDeveloperCalendar()
{
  loadCalendarByAddress('vt75ctnn3ariubc86bffluk290@group.calendar.google.com');
}

/**
 * Adds a leading zero to a single-digit number.  Used for displaying dates.
 */
function padNumber(num)
{
  if (num <= 9) {
    return "0" + num;
  }
  return num;
}

/**
 * Determines the full calendarUrl based upon the calendarAddress
 * argument and calls loadCalendar with the calendarUrl value.
 *
 * @param {string} calendarAddress is the email-style address for the calendar
 */ 
function loadCalendarByAddress(calendarAddress)
{
  var calendarUrl = 'http://www.google.com/calendar/feeds/' +
                    calendarAddress + 
                    '/public/full';
  loadCalendar(calendarUrl);
}

/**
 * Uses Google data JS client library to retrieve a calendar feed from the specified
 * URL.  The feed is controlled by several query parameters and a callback 
 * function is called to process the feed results.
 *
 * @param {string} calendarUrl is the URL for a public calendar feed
 */  
function loadCalendar(calendarUrl)
{
  var service = new 
      google.gdata.calendar.CalendarService('gdata-js-client-samples-simple');
  var query = new google.gdata.calendar.CalendarEventQuery(calendarUrl);
  query.setOrderBy('starttime');
  query.setSortOrder('ascending');
  query.setFutureEvents(true);
  query.setSingleEvents(true);
  query.setMaxResults(50);

  service.getEventsFeed(query, listEvents, handleGDError);
}

/**
 * Callback function for the Google data JS client library to call when an error
 * occurs during the retrieval of the feed.  Details available depend partly
 * on the web browser, but this shows a few basic examples. In the case of
 * a privileged environment using ClientLogin authentication, there may also
 * be an e.type attribute in some cases.
 *
 * @param {Error} e is an instance of an Error 
 */
function handleGDError(e)
{
  document.getElementById('jsSourceFinal').setAttribute('style', 
      'display:none');
  if (e instanceof Error) {
    /* alert with the error line number, file and message */
    alert('Error at line ' + e.lineNumber +
          ' in ' + e.fileName + '\n' +
          'Message: ' + e.message);
    /* if available, output HTTP error code and status text */
    if (e.cause) {
      var status = e.cause.status;
      var statusText = e.cause.statusText;
      alert('Root cause: HTTP error ' + status + ' with status text of: ' + 
            statusText);
    }
  } else {
    alert(e.toString());
  }
}

/**
 * Callback function for the Google data JS client library to call with a feed 
 * of events retrieved.
 *
 * Creates an unordered list of events in a human-readable form.  This list of
 * events is added into a div called 'events'.  The title for the calendar is
 * placed in a div called 'calendarTitle'
 *
 * @param {json} feedRoot is the root of the feed, containing all entries 
 */ 
function listEvents(feedRoot)
{
  var entries = feedRoot.feed.getEntries();
  var len = entries.length;
  
  for (var i = 0; i < len; i++)
  {
  	var entry = entries[i];
    //
    var startDateTime = null;
    var startJSDate = null;
    var startString = "";
    //
    var endDateTime = null;
    var endJSDate = null;
    var endString = "";
    //
    var times = entry.getTimes();
    if (times.length > 0)
    {
      startDateTime = times[0].getStartTime();
      startJSDate = startDateTime.getDate();
      startString = startJSDate.getFullYear()+""+padNumber(startJSDate.getMonth()+1)+""+padNumber(startJSDate.getDate());
      //
      endDateTime = times[0].getEndTime();
      endJSDate = endDateTime.getDate();
      endString = endJSDate.getFullYear()+""+padNumber(endJSDate.getMonth()+1)+""+padNumber(endJSDate.getDate());
    }
    var iBetween = (endJSDate-startJSDate)/86400000;
    if(iBetween <= 1)
    {
    	restArr[restArr.length] =  startString;
    }
   	else
   	{
   		for(var j=0;j<iBetween;j++)
   		{
   			var tempDate = new Date(startJSDate);
   			tempDate.setDate(tempDate.getDate()+(j));
   			//
   			restArr[restArr.length] = 
   			tempDate.getFullYear()+""+padNumber(tempDate.getMonth()+1)+""+padNumber(tempDate.getDate());
   		}
   	}
  }
  setCalProp();init();
  //alert(restArr);
}

google.setOnLoadCallback(initCalLoad);